Ordre de cavites dans le magnesium et l'aluminium irradies aux neutrons rapides

Risbet, A.; Levy, V.

doi:10.1016/0022-3115(74)90069-5

Cited by 38 publications

(13 citation statements)

References 5 publications

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“…At this point, the process of void coarsening starts and the smaller non-aligned voids eventually become subcritical and shrink away. These results corroborate very well experimental observations in void hyperlattice formation in aluminum, in which void sizes just before the void ordering takes place (at 6 NRT dpa) are found to vary in a wide range between 8 and 80 nm in diameter [28].…”

Section: Resultssupporting

confidence: 88%

“…This condition is satisfied in most cases where void-lattice formation is observed [5,[25][26][27]. Exceptions are found in the case of the so called hyper void lattices, such as in neutron irradiated aluminum, where lattices with very large lattice parameter (200-250 nm) are formed from voids as large as 60-90 nm in diameter, undergoing healthy growth (swelling rate $0.5%/NRT dpa) [28,29]. Obviously, stochastic fluctuations can hardly have any effect on the evolution of voids of this size.…”

Section: Introductionmentioning

confidence: 93%

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Non-linear dynamics of microstructure evolution and hyper void-lattice formation

Семенов

Woo

2008

Journal of Nuclear Materials

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Section: Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 93%

Non-linear dynamics of microstructure evolution and hyper void-lattice formation

Семенов

Woo

2008

Journal of Nuclear Materials

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“…For example, the observations of basal-plane alignment of vacancy loops at low temperature [20,21] and voids at high temperature [22] in zirconium alloys are analogous to void ordering in cubic metals. Such a similarity gives additional support to the idea that, with certain modifications accounting for the hcp lattice structure, the PBM will be capable of describing RG.…”

Section: Introductionmentioning

confidence: 95%

Theoretical investigation of microstructure evolution and deformation of zirconium under neutron irradiation

Barashev

Golubov

Stoller

2015

Journal of Nuclear Materials

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a b s t r a c tThe radiation growth of zirconium is studied using a reaction-diffusion model which takes into account intra-cascade clustering of self-interstitial atoms and one-dimensional diffusion of interstitial clusters. The observed dose dependence of strain rates is accounted for by accumulation of sessile dislocation loops during irradiation. The computational model developed and fitted to available experimental data is applied to study deformation of Zr single crystals under irradiation up to hundred dpa. The effect of cold work and the reasons for negative prismatic strains and co-existence of vacancy and interstitial loops are elucidated.

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“…Void coarsening is entirely noise induced by the stochastic fluctuations. Since the so called void "hyperlattices" in Al 59,60 with a lattice constant of about 200 nm are observed at temperatures for which vacancy emission is an important factor in the void evolution, the present approach is, straightly speaking, not applicable to such cases. However, conventional void coarsening due to vacancy emission has been shown to be able to produce spatial ordering in a void ensemble at higher temperatures when vacancy emission from voids becomes important.…”

Section: Discussionmentioning

confidence: 98%

Void lattice formation as a nonequilibrium phase transition

Семенов

Woo

2006

Phys. Rev. B

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The evolution of a void ensemble in the presence of one-dimensionally migrating self-interstitials is considered, consistently taking into account the nucleation of voids via the stochastic accumulation of vacancies. Including the stochastic fluctuations of the fluxes of mobile defects caused by the random nature of diffusion jumps and cascade initiation, the evolution of the void ensemble is treated using the Fokker-Planck equation approach. A system instability signaling a nonequilibrium phase transition is found to occur when the mean free path of the one-dimensionally moving self-interstitials becomes comparable with the average distance between the voids at a sufficiently high void-number density. Due to the exponential dependence of the void nucleation probability on the net vacancy flux, the nucleation of voids is much more favored at the void lattice positions. Simultaneously, voids initially nucleated at positions where neighboring voids are nonaligned will also shrink away. These two processes leave the aligned voids to form a regular lattice. The shrinkage of nonaligned voids is not a usual thermodynamic effect, but is a kinetic effect caused entirely by the stochastic fluctuations in point-defect fluxes received by the voids. It is shown that the shrinkage of the nonaligned voids, and thus the formation of the void lattice, occurs only if the effective fraction of one-dimensional interstitials is small, less than about 1%. The formation of the void lattice in this way can be accomplished at a void swelling of below 1%, in agreement with experimental observation. The dominance of void nucleation at void-lattice positions practically nullifies the effect of void coalescence induced by the one-dimensional selfinterstitial transport.

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Ordre de cavites dans le magnesium et l'aluminium irradies aux neutrons rapides

Cited by 38 publications

References 5 publications

Non-linear dynamics of microstructure evolution and hyper void-lattice formation

Non-linear dynamics of microstructure evolution and hyper void-lattice formation

Theoretical investigation of microstructure evolution and deformation of zirconium under neutron irradiation

Void lattice formation as a nonequilibrium phase transition

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